Nexperia

PESD1FLEX

FlexRay bus ESD protection diode

10. Application information

The device is designed for the protection of two automotive FlexRay data lines from the damage

caused by ESD and surge pulses. The device supports a FlexRay data rate of 10 Mbit/s and

provides a surge capability of up to 200 W per line for an 8/20 µs waveform.

aaa-033539

FlexRay

TRANSCEIVER

FlexRay

bus

common

mode choke

(optional)

BM

RT/2

RT/2

CG

ESD

protection

BP

2

1

3

Fig. 7. Typical application: ESD protection of two automotive FlexRay data lines

Circuit board layout and protection device placement

Circuit board layout is critical for the suppression of ESD, Electrical Fast Transient (EFT) and surge

transients. The following guidelines are recommended:

1. Place the device as close to the input terminal or connector as possible.

2. Minimize the path length between the device and the protected line.

3. Keep parallel signal paths to a minimum.

4. Avoid running protected conductors in parallel with unprotected conductors.

5. Minimize all Printed-Circuit Board (PCB) conductive loops including power and ground loops.

6. Minimize the length of the transient return path to ground.

7. Avoid using shared transient return paths to a common ground point.

8. Use ground planes whenever possible. For multilayer PCBs, use ground vias.

PESD1FLEX

All information provided in this document is subject to legal disclaimers.

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Nexperia B.V. 2021. All rights reserved

Product data sheet

7 November 2021

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